There's many ways, from benign organizing of protests or involving the media all the way down to armed insurrection or terrorist threats. Again, you're a protagonist - choose your own story!
Then there's Ghandi, the Arab Spring, Milošević, the Iranian Shah as examples of things going the other way - and those are just the ones that immediately came to mind.
Again, don't be a bystander believing in foregone conclusions - that way you make them self-fulfilling prophecies. Be part of writing the story instead!
You believe that things only happen to people because they don't "speak up" but it is a goofy belief. There are people that will first fire you, then hit you with sticks and jail you, then shoot you and your kids.
You are not the first person to complain. There is no manager to call. Standing in the street with your friends is a social event. If you're not telling people where and when to show up, what to bring, and why it will work, you're just on the internet stealing valor from real heroes.
